Variable-speed mechanism.



No. 682,227. Patented Sept 10. IQOI. J. PARKER. VARIABLE SPEED MECHANISM.

(Application filed Aug. 29, 1900.)

2 Sheets-Sheet I.

(No Model.)

rrrcni JOHN PARKER, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE BROWN AND SHARPE MANUFACTURING COMPANY, OF SAME PLACE.

VARIABLE-SPEED lVl ECHANISM.

SPECIFICATION forming part of Letters Patent No. 682,227, dated September 10,1901.

Application filed August 29,1900. Serial No. 28,432. (No model.)

To all whom it may concern: connected by means of a universal joint Z) Be it known that 1, JOHN PARKER, of the with any mechanism the speed of which it is city and county of Providence and State of desired to vary. The driving-shaftAcarries Rhode Island, have invented a certain new two series of gears of varying diameters, the 5 and useful Variable-Speed Mechanism; and gears a, a a forming one series and the gears Idoherebydeclare the following specification, a a a" forming the second series, and these taken in connection with the accompanying gears engage two series of loose gears Z3 Z9 drawings, forming a part of the same, to be a and b b b, any one of which may be confull, clear, and exact description thereof. nected with the shaft B by means of devices 66 no The invention relates to mechanism for eflocated between said two series of loose gears. fecting variations in speed and may be em- The gears of each loose series are preferably .ployed in various machines wherein it may mounted to turn one upon the other, with the be desired to vary the speed or relative moveinner gear supported on the shaft B, since mentof parts when using the machine under with the gears thus nested each gear may m5 varying conditions. have a long bearing-surface without increas- By embodying the various features of the ing the space occupied by the series, and the invention in a single structure a simple, commotion between the two engaging surfaces of pact, and efficient mechanism is provided for two gears will be merely adiiferential motion, producing numerous variations in speed, and due to the difference in speed between the 70 co the changes from one speed to another may gears, thus more evenly distributing the wear be quickly and conveniently effected without and friction. The preferred means for conany danger of injury to the parts by reason necting any one of the loose gears to the shaft ofinaccurate adjustments. Such astructure B consists of a ring 0, secured to the shaft B comprises two series of gears of varying dibetween the two series of gears and carrying a5 ameters arranged upon opposite sides of the a series of bolts 0, arranged to engage redevices for connecting any one of said gears cesses 0 formed in the loose gears. The ends to a shaft, which may be a driven or a drivof the hubs of each series of loose gears are ing shaft. The devices for connecting any preferably located in the same plane and the one of the gears to the shaft comprise a ring recesses are preferably formed in the ends of 30 secured to the shaft and carrying a series of the hubs, the bolts in such case extending bolts for engaging the loose gears which are parallel to the shaft B and being arranged in controlled by a cam-sleeve mounted on the line with the hub of the gear with which it is wing. to engage. The position of the bolts is con- In the accompanying drawings, in whicha trolled by a cam d, formed on a sleeve d, 7 'mechanism is shown embodying all the feamounted to turn on the ring O and connected tures of invention in their preferred forms, with the bolts through a series of levers d se- Figure l is a longitudinal sectional view. cured to theends of pinionsd mounted in the Fig. 2 is a cross-sectional view through the ring Cand engagingracks formed on the bolts. connecting-ring and cam-sleeve. Fig. 3 is a As shown, the cam dis a face-cam, and the 0 view showing a development of the camlevers are held in engagement therewith by sleeve; and Fig. 4 is a section on line 4 4, theaction of springs 0 which tend to force the Fig. 2. bolts outward into the recesses in the loose in the construction shown the mechanism gears. The cam cl is provided with a recess or embodying the various features of invention depression (1 into which the'end of a lever 02 5 is employed for effecting variations in speed may pass and allow the corresponding bolt between a driving-shaft A and a driven shaft to be engaged with the proper loose gear. The B, the devices for changing from one speed cam-sleeve may be held in position against to another being mounted upon the driven accidental displacement with the depression shaft. The driving-shaft may be driven by d opposite any lever by a spring-pin (Z hav- :00 "so means of a belt passing over a pulley a, seing a spherical recess in its end arranged to cured thereto, and the driven shaft may be engage the ends of the pinion d, which are rounded for this purpose. With these devices for connecting the loose gears to the shaft it is impossible for more than one gear to be connected with the shaft at the same I time, and any gear may be disconnected from the shaft and any other gear be quickly and conveniently connected thereto by merely turning the cam-sleeve into the proper position, which may be indicated by marks on the ring and sleeve, if desired. This means of connecting the loose gears to the shaft may be used with advantage with a single series of loose gears and is also a simple and efficient device for use in connection with two series of gears locatedupon opposite sides of the rin What I claim as my invention, and desire to secure by Letters Patent, is-

1. A variable-speed mechanism com prising a shaft, two series of gears of varying diameters, and devices between said two series of gears for connecting any one of the said gears to said shaft.

2. A variable-speed mechanism comprising a shaft, two series of nested gears of varying diameters, a ring secured to said shaft be-' tween said series of gears, and a series of bolts carried by said ring for connecting said ring and any one of said gears.

3. A variable-speed mechanism comprising a shaft, a series of gears, a ring secured to the shaft, a series of connecting devices carried by said ring and arranged to connect any one of said series of gears with said ring, and means for operating said connecting devices.

4t. Avariable-speed mechanism comprising a shaft, a series of gears, a ring secured to the shaft, 2. series of bolts mounted in said ring and arranged to connect said gears with said ring, and a cam-sleeve mounted on said ring for controlling said bolts.

5. Avariable-speed mechanism comprising a shaft, a series of gears, a ring secured to said shaft, a series of bolts mounted in said ring, a series of levers connected with said bolts, and a sleeve provided with a cam for engaging said levers.

(5. A variable-speed mechanism comprising a shaft, a series of nested gears having recesses in the ends of the hubs, a ring secured to the shaft, spring-pressed bolts mounted.

in said ring in line with said hubs, racks on said bolts, pinions engaging said racks, levers secured to said pinions, a camsleeve mounted to turn on said ring, and a cam on said sleeve engaging said levers.

' JOHN PARKER.

Witnesses:

JAMES H. THURsroN, W. H. THURSTON. 

